Regardless your regiment...

Besides knowing about the titans inside the walls, news had reached you that titans breached Wall Rose, atleast, that's what they thought.

You decided to help in both locating the wall and evacuating the citizens that are located near the breached area.

If you're with Christa, Reiner and etc. The people at Utgard castle:
As a scout with gears: You are the only survivor and ran out of gas as you retreat to the top where the young ones(104th) are.

As a scout with no gear: You along with the others of 104th hoped to get out of this as you watch every veteran die.

If you're with Hange & the others:
Regardless your regiment....
After finding out partially of secret from the Church, you followed the scouts to Utgard castle to save the others and found out that one of them is a titan shifter